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Old 04-07-2017, 09:13 PM
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Default 2000 cr250 bogging

     

Good evening all,

I have a 2000 cr250 that is running like crap. Has tons of power in the low rpms, and takes off great with full throttle. But once a it's half way through it's rpm range it just Boggs and has no power. It sometimes catches itself and pulls hard again at the end of the range. I have check the power valve and made sure it rotated when revved and that's good. Pulled the carb which was clean and I recleaned it. Set the float to factory settings think it was 16mm but it was back to stock. Same with the jets 180 and 48 I believe but it is back to factory settings. Same with the needle position. Air fuel screw is 1.5 turns out. Reeds look good. Compression test checked out at 195psi. And a leak down test held. I'm thinking it's electrical but just stumped at this point. Any advise or places to look at would be great.

Thanks,

Chris

Last edited by callen8365; 04-08-2017 at 05:09 PM.
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Old 04-07-2017, 10:22 PM
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Float height should be 16mm; at 19 it's got less fuel than it needs. Also, when discussing jetting it is useful to describe your altitude and temperature. I have the same bike, am only a few hundred feet above sea level, air temp in the 90+ most of the year, and I run a 175 (I think... it may be 178) that is slightly rich but it pulls through.
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Old 04-07-2017, 10:56 PM
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Quote:
Originally Posted by gusco View Post
Float height should be 16mm; at 19 it's got less fuel than it needs. Also, when discussing jetting it is useful to describe your altitude and temperature. I have the same bike, am only a few hundred feet above sea level, air temp in the 90+ most of the year, and I run a 175 (I think... it may be 178) that is slightly rich but it pulls through.
Thanks for getting back to me. I'm at sea level currently (testing this thing with 64 degree weather. But I just figured out the issue. My coil I believe to be bad. My primary coil reads are 0.8ohms and the book says it should be 0.1-0.3ohms. My secondary coil reads were 9.2 barely in spec with a range of 9-16ohms. And it was a typo it's at 16mm or whatever the book states.

Thanks for the help,

Chris

Last edited by callen8365; 04-07-2017 at 11:51 PM.
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Old 04-08-2017, 07:19 AM
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Before you just stick another coil n it...
Clean the coil mounts of rust and dirt as well as the wire connections.
Then remove the plug cap and trim 1/4" off the sire and reinstall the cap.
Then redo the ohm readings to see if they are better.
Then reset the float height to 16mm.

Paw Paw
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Old 04-08-2017, 01:31 PM
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Quote:
Originally Posted by PawPaw View Post
Before you just stick another coil n it...
Clean the coil mounts of rust and dirt as well as the wire connections.
Then remove the plug cap and trim 1/4" off the sire and reinstall the cap.
Then redo the ohm readings to see if they are better.
Then reset the float height to 16mm.

Paw Paw
Thanks Paw Paw that was a typo "o" the floats are 16mm I was even thinking that as I was typing, but put in 19 by mistake. I did clean up everything very well before taking reads fearing it was a bad ground. I did not cut off anything from the wire though. But that first read being out of spec by .6omhs would tell me it's bad right? I'll cut a little off the wire for the cap and see if any reads change. Also oem coil or is aftermarket stuff okay? On eBay they have second hand oem and brand new aftermarket for under 20 bucks shipped to my house. Are those okay? I'm leaning more to oem from rockymountain. But if I can save a buck or two for something that is reliable and won't fail, I'm always game for it. What are your guys take?
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Old 04-08-2017, 02:59 PM
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Check exaust port and muffler and spark arrestor , basic stuff is key , before swapping parts ...
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Old 04-09-2017, 11:19 AM
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Originally Posted by bweighmaster89 View Post
Check exaust port and muffler and spark arrestor , basic stuff is key , before swapping parts ...
What do you mean check the exhaust port? But packing in muffler is fresh. Spark plug is fresh, gas and premix is new. Carb rebuilt and adjusted back to factory settings (will reject once issue is fixed which I'm sure it's the coil since that tested bad.) Transmission oil is new. Reeds look good. I agree with having everything in good shape before swapping parts that's for sure.

Chris
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